Analysis of "2010.8.22" rainstorm in Dali Bureau

Conventional meteorological data,TBB data of satellite images and wind profile radar and other information were used to analyze sudden rainstorm process on August 22,2010 in Dali bureau.The results showed that the shear line is the main impact weather system of rainstorm.Heavy rain occurred in the cold MCC which the temperature was-52 ℃.Physical fields were good with heavy rain weather process.Low-level atmosphere is convergence and upper level is divergence.Strong vertical ascending motion caused the occurrence of heavy rain.The changes of negative vertical velocity and signal noise ratio of wind profile radar could reveal the changes of mesoscale and microscale systems.The negative rainfall vertical velocity and signal noise ratio also increased when the rain was strong.It was help to improve the monitoring and early warning of mesoscale and microscale systems.